Rayo's number

noun

The smallest number bigger than any finite number named by an expression in the language of set theory with a googol symbols or less.

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Meanings

noun
  1. The smallest number bigger than any finite number named by an expression in the language of set theory with a googol symbols or less.

Origin

Named after Agustín Rayo.

Full word history & related roots →
Cite this entry
APA

Rayo's number. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Rayo's%20number

MLA

“Rayo's number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Rayo's%20number. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Rayo's number,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Rayo's%20number.

Source: Rayo's number on Wiktionary, CC BY-SA 4.0.